Germany’s energy transition is at a crossroads. For years, our power system has operated on an “Energy-Only Market” (EOM), where generators are paid only for the kilowatt-hours they produce. But as we lean more on sun and wind, we need a guaranteed backup for calm, dark periods.
The solution? A capacity market, set to start in 2028. This new system would pay for reliable power plant capacity to be on standby, ready to generate when needed. The goal is noble: ensuring security of supply. However, the design of this capacity market is everything. Get it wrong, and we risk propping up old fossil fuel structures. Get it right, and we can accelerate a truly modern, flexible energy grid.
The Central Debate: Which Path to a Secure Grid?
The big question isn’t if we need a capacity market, but what kind. The previous government’s Options Paper outlined three main models, but the political shift means the final capacity market design is still up for grabs. Understanding these options is crucial for our energy future.
Let’s break them down:
1. The Centralized Model: A Top-Down Approach
This model operates like a government-led procurement agency. A central body calculates the needed capacity and holds auctions to secure it.
The Risk: This approach is inherently bureaucratic. It tends to favor large, conventional power plants that are easy to quantify, potentially sidelining innovative technologies like battery storage and demand-side flexibility. By guaranteeing income for fossil generators, it could artificially extend their lifespans, slowing down the energy transition. Furthermore, it could suppress the “scarcity prices” in the existing energy market that are essential for new, agile technologies to turn a profit.
2. The Decentralized Model: A Market-Led Solution
Here, the market itself drives the solution. The government sets a reliability standard, and energy suppliers are responsible for proving they have enough capacity (their own or through contracts) to meet their customers’ peak demand.
The Advantage: This model is inherently efficient and competitive. It doesn’t pick winners; it lets the market find the most cost-effective solutions. This creates powerful incentives for innovation, unlocking business cases for storage, flexible consumption in industry, and other distributed resources. It puts flexibility at the forefront.
3. The Hybrid Model: The Best of Both Worlds?
The preferred model of the last Federal Ministry for Economic Affairs attempts to merge the two. It would combine a decentralized obligation with a central “safety net” for procuring any remaining capacity.
The Challenge: While promising in theory, the hybrid model’s greatest enemy is complexity. Merging two intricate systems requires flawless coordination and could lead to an overly regulated, bureaucratic outcome. The pressing question is whether such a complex system can be designed, agreed upon, and implemented reliably by the 2028 deadline.
The Critical Element: Don’t Forget Existing Flexibility
A successful capacity market design must not just build new capacity; it must also recognize and reward the flexibility we already have. Power plants like biomass and highly efficient combined heat and power (CHP) units already provide crucial balancing power to the grid.
Similarly, agile players in the short-term electricity markets (Day-Ahead and Intraday) help smooth out price and generation volatility every day. The new system must integrate these assets, not push them out by creating a market that only values new, large-scale projects.
The Way Forward: Principles for a Future-Proof Market
As the debate continues, several principles must guide the final capacity market design:
Reward Innovation, Not Inertia: The market must be technology-neutral, creating a level playing field where batteries and demand-response can compete fairly with gas turbines.
Minimize Bureaucracy: Over-regulation is the enemy of agility and investment. A simple, clear framework will attract more diverse participants than a complex one.
Establish Legal Certainty: Investors need a clear and stable set of rules to commit the billions needed for new, clean capacity.
The transition is inevitable. By choosing a decentralized or strongly decentralized-hybrid capacity market design, Germany can create a dynamic, competitive system that harmonizes renewables, storage, flexible consumers, and backup power. Let’s ensure our capacity market becomes the engine of the energy transition, not its brake.